When I bought mine a little more than 2 weeks ago, I was given a screen protector and a $5 Starbucks gift card.
Because I was an ***** and screwed up putting the free protector on my Band... *grumble grumble* I went back to the Microsoft store in Charlotte and had to purchase a new one (I asked them to put it on so I wouldn't mess it up again haha). The associate seemed to believe that, at least in Charlotte's store, the screen protectors were solely to be given out when a customer purchased a Band and that they weren't actually for normal sale. It turned out that they could sell them (they're $10 a piece, by the way), but he made it seem like they would always be tied to a Band's purchase - thus, for now, being free.